Water flows over a waterfall 20. m high, at the rate of 4.0 × 104 kg/s. If this water powers an electric generator with a 40% efficiency, how many watts of electric power can be supplied?
What will be an ideal response?
3.1 MW
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What spectacular development in organisms marks the beginning of the Paleozoic era?
What will be an ideal response?
Large molecular clouds will form into protostars because of ____
a. the thermal motions of the atoms in the gas cloud b. gravitational contraction c. radiation pressure from nearby stars d. the temperature reaching a critical point e. condensation of dust and gas
What is a Starburst Galaxy?
A.) A galaxy whose spiral arms have been stretched out into a star-like shape. B.) A galaxy with a supermassive black hole at the center. C.) A galaxy with a very high rate of star formation. D.) A galaxy with multiple supernovae. E.) A galaxy with a lot of gamma-ray emission.
The overall helium fusion reaction is ________
A) four helium nuclei fuse to form one oxygen nucleus B) two hydrogen nuclei fuse to form one helium nucleus C) three helium nuclei fuse to form one carbon nucleus D) two helium nuclei fuse to form one beryllium nucleus